Sentra Wagon FWD L4-1597cc 1.6L SOHC (GA16i) (1989)
Throttle Position Sensor: Component Tests and General Diagnostics
Fig. 153 Throttle Sensor Inspection
1.
Disconnect throttle sensor connector.
2.
Using an ohm meter, check resistance across terminals e and f.
Resistance value should change smoothly, without any glitches, as throttle is moved from idle to WOT.
Replace sensor if it fails the above test.